GNU Radio 2.x: gr_remez.h File Reference

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# gr_remez.h File Reference

`#include <gr_types.h>`
`#include <string>`
`#include <stdexcept>`

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## Functions
std::vector< double > | gr_remez (int order, const std::vector< double > &bands, const std::vector< double > &ampl, const std::vector< double > &error_weight, const std::string filter_type="bandpass", int grid_density=16) throw (std::runtime_error)
| Parks-McClellan FIR filter design.

## Function Documentation

std::vector<double> gr_remez | ( | int | order,
|  | const std::vector< double > & | bands,
|  | const std::vector< double > & | ampl,
|  | const std::vector< double > & | error_weight,
|  | const std::string | filter_type = "bandpass",
|  | int | grid_density = 16
| ) | throw (std::runtime_error)

  | Parks-McClellan FIR filter design. Calculates the optimal (in the Chebyshev/minimax sense) FIR filter inpulse reponse given a set of band edges, the desired reponse on those bands, and the weight given to the error in those bands. Parameters:
  order | filter order (number of taps in the returned filter - 1)
  bands | frequency at the band edges [ b1 e1 b2 e2 b3 e3 ...]
  ampl | desired amplitude at the band edges [ a(b1) a(e1) a(b2) a(e2) ...]
  error_weight | weighting applied to each band (usually 1)
  filter_type | one of "bandpass", "hilbert" or "differentiator"
  grid_density | determines how accurately the filter will be constructed. \ The minimum value is 16; higher values are slower to compute.
  Frequency is in the range [0, 1], with 1 being the Nyquist frequency (Fs/2) Returns: vector of computed taps Exceptions:
  std::runtime_error | if args are invalid or calculation fails to converge.